21361461 has 24 divisors (see below), whose sum is σ = 31728480. Its totient is φ = 12772320.

The previous prime is 21361447. The next prime is 21361463. The reversal of 21361461 is 16416312.

It is not a de Polignac number, because 21361461 - 2⁶ = 21361397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21361463) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29775 + ... + 30483.

It is an arithmetic number, because the mean of its divisors is an integer number (1322020).

Almost surely, 2^21361461 is an apocalyptic number.

It is an amenable number.

21361461 is a deficient number, since it is larger than the sum of its proper divisors (10367019).

21361461 is a wasteful number, since it uses less digits than its factorization.

21361461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817 (or 806 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 21361461 is about 4621.8460597471. The cubic root of 21361461 is about 277.4663476763.

Adding to 21361461 its reverse (16416312), we get a palindrome (37777773).

The spelling of 21361461 in words is "twenty-one million, three hundred sixty-one thousand, four hundred sixty-one".